Work on demo

aiohttp_security/__init__.py

@@ -1,10 +1,13 @@
 from .abc import AbstractIdentityPolicy, AbstractAuthorizationPolicy
 from .api import remember, forget, setup, authorized_userid, permits
+from .cookies_identity import CookiesIdentityPolicy
+from .session_identity import SessionIdentityPolicy
 
 
 __version__ = '0.1.0'
 
 
 __all__ = ('AbstractIdentityPolicy', 'AbstractAuthorizationPolicy',
+           'CookiesIdentityPolicy', 'SessionIdentityPolicy',
            'remember', 'forget', 'authorized_userid',
            'permits', 'setup')